The work describes the anelastic behaviour of human dentin below room temperature. Human molars, extracted from individuals as part of their dental treatment, were cut to obtain bar-shaped samples for mechanical spectroscopy (MS) experiments. Repeated cooling-heating cycles in the range 300-100 K have been carried out on the same samples. In the cooling stage of the first cycle Q-1 exhibits a very broad maximum due to a series of phase transformations involving water present in the pores, in the interstices between fibres, between fibrils and inside collagen triple helix. The formation of ice Ih produces permanent damages to the dentin structure (rupture of fibres and fibrils) leading to a decrease of maximum intensity in the following cycles. In the heating stage of all the cycles two maxima, M1 and M2, have been observed around 155 K and 178 K. M1 is due to the transformation of LDA ice into ice IC while M2 to that of ice IC to ice Ih. Above 200 K, Q-1 progressively increases with lower damping values in the cycles after the first one.

S., A., E., B., E. G., C., I., C., Montanari, R. (2012). Anelastic phenomena in human dentin below room temperature, 184, 455-460.

Anelastic phenomena in human dentin below room temperature

MONTANARI, ROBERTO
2012-01-01

Abstract

The work describes the anelastic behaviour of human dentin below room temperature. Human molars, extracted from individuals as part of their dental treatment, were cut to obtain bar-shaped samples for mechanical spectroscopy (MS) experiments. Repeated cooling-heating cycles in the range 300-100 K have been carried out on the same samples. In the cooling stage of the first cycle Q-1 exhibits a very broad maximum due to a series of phase transformations involving water present in the pores, in the interstices between fibres, between fibrils and inside collagen triple helix. The formation of ice Ih produces permanent damages to the dentin structure (rupture of fibres and fibrils) leading to a decrease of maximum intensity in the following cycles. In the heating stage of all the cycles two maxima, M1 and M2, have been observed around 155 K and 178 K. M1 is due to the transformation of LDA ice into ice IC while M2 to that of ice IC to ice Ih. Above 200 K, Q-1 progressively increases with lower damping values in the cycles after the first one.
2012
In corso di stampa
Rilevanza internazionale
Articolo
Sì, ma tipo non specificato
Settore ING-IND/21 - METALLURGIA
English
Dentin, Internal friction, Dynamic modulus, Low temperature
S., A., E., B., E. G., C., I., C., Montanari, R. (2012). Anelastic phenomena in human dentin below room temperature, 184, 455-460.
S., A; E., B; E. G., C; I., C; Montanari, R
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/53770
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